Lasting and tacking machine.



A. T. CHAPLIN.

LASTING AND TACKING MACHINE.

APPLICATION FILED AUG.3I, 1912.

1, 1 97,604: Patented Sept. 12, 1916.

2 SHEETSSHEET 1.

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LASTING AND TACKING MACHINE.

I APPLICATION FILED AUG-31.3912. 1,197,604.

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Patented Sept. 12, 1916.

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' TED STATES FATE I BEIGE.

ALFRED THOMAS CHAPLIN, OF LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

LASTING AND TACKING MACHINE.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application filed August 31, 1912. Serial No. 718,040.

To aZZ whom it may concern Be it known that I, ALFRED T. CHAPLIN, a subject of the King of England, residing at Leicester, Leicestershire, England, have invented certain Improvements in Lasting and Tacking Machines, of which the follow ing description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention concerns improvements in or relating to the tack-driving devices of lasting or pulling-over machines which drive tacks in groups in shoemaking operations.

In certain machines it has been proposed to drive a group of two or more adjacent tacks at the same time and to do so. by arranging a single driver bar to carry at its end a plurality of drivers. There has, however, been considerable ditliculty under certain conditions in driving each of the tacks the correct distance into the work. For example, at the toe or other parts where there is a plait or where for any other reason the surface of the work happens to be higher at the place where one tack is to be driven than at the place where the other is to be driven, it will be obvious that in order that both the tacks may be flush with the work they should be driven to diiferent extents. It has been found that with a single driver bar that tack which is driven into the higher part of the work may either be driven flush with the work, in which case the second tack on the adjacent lower part of the work is left upstanding, or the first tack may be driven so far into the work as to force the head well into the surface of the work and so damage it, and even in this latter case the second tack may still be left upstanding. In machines to which the work is manually supported the result that is obtained, of course, in each case Wlll depend upon the force with which the operator holds the work up to the drivers, for if he exerts great force the tack at the higher or thickened portion of the work will 'be'driven too far, and the other tack may or may not be driven sufficiently, while if he exerts only the usual force the first tack will be driven correctly, and the second tack will be left up standing. This, of course, is a disadvantage, and it is an object of the present invention to obviate it. This may be done by making the two drivers independent of one another, so that each will drive in the manner of the usual single driver. Again, in a machine adapted to drive a group of two adjacent tacks by means of a single driver bar, since both tacks are driven at the same time, the

operator has to exert double the usual force to sustain the last against the impact of the drlver, and of course ifthe group consisted of more than two tacks the force which he would be required to exert wouldbe correspondlngly greater. This disadvantage may be eliminated by causing the drivers to operate at different times.

An lmportant feature of the invention consists in relatively movable drivers arranged to insert a plurality of tacks in close proxlmity to each other, combined with independent operating springs for the drivers, and means constructed and arranged to raise the drivers and tension the springs and to release the drivers in predetermined time relation to each other for permitting operation by their springs. In accordance with another feature of this invention the excessive effort for holding the shoe up to the machine will be eliminated by so arranging the actuation of the independent drivers that they drive their "tacks at different times so that the operator limited to the construction set forth, since it is obvious that changes might be made both in the construction and in the arrangement of the parts without departing from the spirit of the invention.

The parts of the machine not described may be and are in the present instance similar to and are operated in a manner similar to the operation of the corresponding parts of the machine of the said patent.

1n the drawings :Figure l is a side elevation of so much of the machine as is necessary for the understanding of the present invention; Fig. 2 is a front elevation of certain of the parts shown in Fig. 1, showing one construction of lifting device; Fig. 3 is a plan, partly in section, of the operating mechanism for the independent drivers; and Fig. 4 is a front elevation of certain of the parts shown in Fig. 1, provided with a lifting device of the second construction.

In the machine about to be described two driver bars 2, 4 are provided and are mounted for reciprocation in grooved guideways in the machine head in a manner similar to the mounting of an ordinary single driver bar. At the lower end of the driver bar 4 a driver 5 is mounted in the ordinary manner, but for mounting the second driver 6 a somewhat difierentconstruction is used 1 n order that it may be placed as close as is desirable to the driver 5. At the lower end of the driver bar 2, which is considerably shorter than the driver bar 4, there vis a lug 8, Fig. 2, projecting toward the driver bar 4, and in this lug is a recess in which is mounted an extension bar 10 that projects through and is directed by a guide bracket 12. At the lower end of. the extension bar the driver 6 is mounted in the ordinary manner.

In the head of the machine there is a bracket 20, Fig. 1, in which is fixed a spindle 22 carrying loosely mounted upon it two arms 24 and 25, these being recessed at their ends to receive the upper ends of spherical ended links attached to the two driver bars 2, 4. The arm 25 is provided with a coiled spring 26, one end of which is fixed to a lug 28 upon the arm, the other end being attached to the boss of a ratchet wheel 29 loosely mounted upon the spindle 22. In an extension from the bracket 20 is mounted a pivot pin 32 upon which is a pawl 34 adapted to coeperate with the ratchet wheel 29, the pawl being held in contact with the ratchet wheel by means of a spring 36 pressing against its tail 38. The direction of the teeth upon the ratchet wheel is such that as the arm 25 is lifted by the raising of the driver bar 4 the ratchet wheel will be held from movement and consequently the spring 26 will be compressed, thus storing the energy required to operate the driver bar in its driving movement. By meansof the ratchet wheel and pawl any desired degree of compression of the spring and therefore any desired driving force may be obtained. The arm 24 is provided with similar mechanism so that. the tension of each spring may be adjusted independently a and the drivers may be operated also inbars and held in place by adjustable lock nuts, the collars striking against a stationary part of the machine, in this instance the top of the head in which the bars reciprocate, and being prevented thereby from further downward movement.

In order to raise the driver bars against the action of their springs into driving position a cam is provided at the back of the bars ,and is mounted at the front end of a shaft journaled in bearings in the machine frame and rotated. from the main shaft through any convenient mechanism.

Two constructions of the driver-lifting cam will be described, either of which is within the scope of the invention but one or other of which may be found more suitable in particular circumstances. According to the first construction a cam is 1 mounted upon the front end of a shaft 44 and. is adapted to act. upon an abutment 46 at the back of the driving bar 4. This bar has projecting from. it a shoulder 48 arranged to engage with a ledge 49 upon the driver bar 2. Thus rotation of the cam45 first lifts the driver bar 4 and then the driver bar 2 through the bar 4. The cam' is circular except at a certain part where there is a deep indentation 50, the leading side of which is almost radial. Consequently as soon as the abutment 46 passes over the edge of this side of the indentation thespring 26 will act upon the driver bar to force it downward to drive the fastener. The other side of the indentation is shaped at any convenient angle to act easily upon the abutment 46 to raise the driver bars. During the first part of the lift of the camactuated driver bar 4 there is provision for lost motion between the shoulder 48 and the ledge 49 so that the driver bar 2 will not be raised so far as the driver bar 4. Consequently when the cam releases the driver bar 4 both bars 4 and 2,will descend in unison under the action of their separate springs, but as the second bar 2 has not been raised quite so high as the first bar 4 it will contact with its tack and drive it into the work ahead of the first driver bar 4 because of the lost motion. It will be seen that by these means the drivers are operated independently of one another, so that each will act as an ordinary single driver to drive its tack the correct distance into the work. Not only so, but since the two drivers act at different times, the operator has to sustain the shoe against the impact of only one driver at a time, and consequently this construction gives a double advantage.

According to the second construction of lifting cam (see Fig. 4) a single cam, is provided to lift both driver bars as in the former construction but it acts directly upon the second driver bar and not indirectly through the first. The driver bars 2, 4 are provided respectively with abutments When the cam is placed centrally between the driver bars as in the illustrated construction, it is preferable that the leading side 61 of the indentation should be undercut in order that the drop of the second abutment 62 to its lowermost position should be unobstructed. As the cam rotates the leading side 61 will first pass from under the abutment 64: and the spring 26 will operate the driver bar 4 downward to drive a tack. As the cam continues to rotate the side 61 will next pass from under the abutment 62 thus releasing the driver bar 2 to drive a tack. Thus it will be seen that again by this construction the two driver bars act in driving independently of one another and act also at different times. It will be noted that in both constructions the lifting of the drivers to tension their springs 26 is initiated successively for the two drivers so that this load, which is frequently the heaviest coming on the machine in any part of its cycle, is distributed.

It will be obvious that in both constructions the drivers might be arranged to op erate at the same time although so far as is at present known it is'preferable that they should operate at different times.

Having thus described my invention,what I claim as new and desire to secure by Letters Patent of the United States is 1. A fastening machine having a group of tack drivers arranged to insert a group of tacks, means to raise the drivers into position to be actuated, means to operate the drivers, and a lost motion connection between two drivers of a grouparranged to raise one driver higher than the other whereby simultaneous operation of the drivers will effect the insertion of one tack later than the other.

2. A machine of the class described having, in combination, a group of tack driver bars arranged side by side and provided with drivers to insert a group of tacks in close proximity to each other, and an independent operating device for each driver comprising a spring mechanism provided with adjusting means including a pawl and a ratchet wheel.

3. A fastening machine having a group of tack drivers arranged to insert a group of tacks, a driver lifting cam common to a plurality of said drivers, and connections from the cam to two of said plurality of drivers arranged to delay the action of one driver in inserting a fastening into the work until after the other driver has caused the fastening being driven by it to enter the work.

at. A fastening machine having a group of tack drivers arranged to insert a group of tacks in close proximity to each other, a lost motion connection between two of said drivers, and a cam acting directly on one driver and acting on the other through said connection to operate one driver ahead of the other.

5. A fastening machine having a group of tack drivers arranged to insert a group of tacks, a driver lifting cam 45, an abutment 46 on the back of one driver projecting into the path of the cam for causing that driver to be lifted, a shoulder &8 on said driver, and a ledge 49 on another driver arranged to be engaged by said shoulder for lifting said other driver.

6. A machine of the class described having, in combination, relatively movable and tensioning the springs thereof one after the other and then releasing the drivers for permitting operation by their springs.

7. A machine of the class described hav ing, in combination, relatively movable drivers arranged to insert a plurality of tacks in close proximity to each other, independent operating springs for the drivers, and a cam constructed and arranged to raise the drivers and to tension the springs and to release the drivers in predetermined time relation to each other for permitting operation by their springs.

8. A machine of the class described having, in combination, relatively movable drivers arranged to insert a plurality of tacks in close proximity to each other, independent operating springs for the drivers, and a lifting cam for the two drivers, said cam and drivers being constructed and arranged for the drivers to be lifted to different heights.

9. A machine of the class described having, in combination, relatively movable drivers arranged to insert a plurality of tacks in close proximity to each other, independent operating springs for the drivers, and a lifting cam, said cam and drivers being constructed and arranged relatively to cause the drivers to be lifted to different heights and to be released simultaneously to the control of the driver springs.

10. A machine of the class described having, in combination, relatively movable drivers arranged to insert a plurality of tacks in close proximity to each other, independent operating springs for the drivers, and a single cam for lifting the two drivers, said parts being constructed and arranged to operate the drivers to insert two tacks in succession.

11. A machine of the class described having, in combination, relatively movable drivers arranged to insert a plurality of tacks in close proximity to each other, driver bars for said drivers, one bar being shorter than the other bar and having a recessed lug projecting toward said other bar, an extension bar secured in said recess and directly carrying one of the drivers, and a guide bracket for the extension maintaining the two drivers in close proximity.

12. A machine of the class described having in combination two adjacent tack driver bars, adjacent driver arms operatively connected therewith, a spindle on which said arms are loosely mounted, separate springs each having one end fixed in one of the arms, ratchet wheels loosely mounted on the spindles and to which the other ends of the springs are attached, and pawls arranged to engage the respective ratchet wheels for maintaining the springs adjustably tensioned independently of each other.

13. In a fastening inserting machine, two driver bars, driver springs against which the bars are lifted, and bar lifting and spring tensioning means constructed and arranged to initiate tensioning of the said driver springs successively.

14. In a fastening inserting machine, two

Copies of this patent may be obtained for driver bars, bar depressing means, a lifting cam, a shoulder on one bar arranged to be engaged by the cam for lifting that bar, and a connection from the first bar to the sec- 0nd by which the latter is lifted indirectly by the cam.

15. A machine of the class described having, in combination, a machine head having a guideway, two driver bars arranged side by side for reciprocation in the guideway, drivers carried on the lower ends of the bars, a bracket on the machine head, a spindle in the bracket, driver arms fulcrumed on the spindle, springs arranged to operate the arms to depress the driver bars, and a single lifting cam arranged adjacent to the driver bars for raising them and holding them up against the pressure of their springs.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED THOMAS CHAPLIN.

Witnesses:

FREDERICK WILLIAM WORTH, CLAUD BENNION.

five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

